A charge moving with velocity v in X-direction is subjected to a field of magnetic induction in negative X – direction . As a result, the charge will

A long solenoid carrying current  produces a magnetic  field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is  :

At what distance from a long straight wire carrying a current of 12 A will the magnetic field be equal to 3 x 10^-5 Wb/m²?

Two circular coils 1 and 2 are made from the same wire but the radius of the 1^st coil is twice that of the 2^nd coil.  What is the ratio of potential difference applied  across them so that the magnetic field at their centres are  same?

A charged particle (charge q ) is moving in a circle of radius R with uniform speed v. The associated magnetic moment μ is given by :

A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying same current. The strength of magnetic field far away is

A 10 eV electron is circulating in a plane at right angles to a uniform field of magnetic induction 10^-4 Wb/m² ( =1.0 gauss). The orbital radius of the electron is

A charged particle of charge q and mass m enters perpendicularly in a magnetic field  Kinetic energy of the particle is E, then frequency of rotation 

The magnetic field at a distance  r from a long wire carrying current  I is 0.4 T.  The magnetic field at a distance 2r is

A deutron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 m in a plane perpendicular to magnetic field B.  The kinetic energy of the proton that describes a circular orbit of radius 0.5 m in the same plane with the same B is